ios - 更改 UINavigationBar 中 UIBarButtonItem 的宽度

Question

我正在创建一个 UIBarButtonItem 并将其添加到我的导航栏中，如下所示:

(void)viewDidLoad { 

   ...

   // Add the refresh button to the navigation bar
   UIButton *refreshButton = [UIButton buttonWithType:UIButtonTypeCustom];
   [refreshButton setFrame:CGRectMake(0,0,30,30)];
   [refreshButton setImage:[UIImage imageNamed:@"G_refresh_icon.png"] forState:UIControlStateNormal];
   [refreshButton addTarget:self action:@selector(refreshData) forControlEvents:UIControlEventTouchUpInside];
   UIBarButtonItem *refreshBarButton = [[[UIBarButtonItem alloc] initWithCustomView:refreshButton] autorelease];
   self.navigationItem.leftBarButtonItem = refreshBarButton;
}

运行时它看起来是正确的，但我可以通过在 x = 0 到大约 100 之间的任意位置点击导航栏来选择栏按钮项目。如何将可选区域的宽度调整为 30 像素？

Answer 1

从 iOS 11 开始，只为 customView 而不是 UIBarButtonItem 设置框架将不起作用(如 accepted answer 中的建议)。似乎将自动布局添加到 UIBarButtonItem 会覆盖设置的框架。 This post给了我一个想法:

navigationItem.leftBarButtonItem?.customView = yourCustomButtonView
let desiredWidth = 35.0
let desiredHeight = 35.0

let widthConstraint = NSLayoutConstraint(item: yourCustomButtonView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: desiredWidth)
let heightConstraint = NSLayoutConstraint(item: yourCustomButtonView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: desiredHeight)

yourCustomButtonView.addConstraints([widthConstraint, heightConstraint])

另请注意，您最好使用 UIButton 作为您的 CustomView，因为您必须依赖它来触发操作。